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Class 12 NEET Physics Optics Questions Part 2
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© examsnet.com
Question : 3
Total: 50
A light ray enters through a right angled prism at point
P
with the angle of incidence
30
∘
as shown in figure. It travels through the prism parallel to its base
B
C
and emerges along the face
A
C
. The refractive index of the prism is
[NEET 2024]
√
5
4
√
5
2
√
3
4
√
3
2
Validate
Solution:
👈: Video Solution
In prism,
r
1
+
c
=
A
r
1
=
90
∘
−
c
..........(1)
s
i
n
c
=
1
µ
⇒
cos
c
=
√
µ
2
−
1
µ
⇒
Apply Snell's law, on incidence surface
1
⋅
s
i
n
30
∘
=
µ
s
i
n
(
r
1
)
⇒
1
×
1
2
=
µ
×
s
i
n
(
90
∘
−
c
)
1
2
=
µ
×
√
µ
2
−
1
µ
On squaring
1
4
=
µ
2
−
1
⇒
µ
2
=
5
4
⇒
µ
=
√
5
2
© examsnet.com
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